Keep moving, and when you see a plane fly in close, try to get some sort of cover between it and you. The planes have a laser attack that will absolutely destroy your health this is the biggest threat. Planes will arrive to drop off some soldiers, and despite the planes themselves having health bars, it's pretty tough to take them down. Soon you'll find yourself on the roof with only one mission objective: survive. You're going to have infinite enemies here, so don't dawdle just shoot any who are in your immediate way, but make your way to the blue waypoint as quickly as possible. You'll be in Technically Legal, and you'll have to fight your way out.
Meet with Viola, then watch the cut scene. This mission becomes available after getting through The Ho Boat.